3B03 偏光紫外吸収分光法と表面SHGを用いたラビング/光配向膜上に蒸着した液晶単分子膜の配向観察

概要

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We have investigated the molecular orientation of a liquid crystal, pentylceanobiphenyl (5CB) evaporated on a polymer alignment layer by means of polarized ultraviolet absorption spectroscopy and surface second-harmonic generation. The results unambiguously reveal that the in-plane anisotropy is diminishingly small in the films thinner than monolayer, although the films more than monolayer have a finite constant value of in-plane anisotropy. This drastic change indicates that molecules on rubbed surface do not align well without the influence of the inter-molecular interaction of liquid crystals. Namely polyimide alignment layer only specifies the direction by giving small anisotropy, and the real in-plane anisotropy starts to appear when liquid crystal molecules start to contact to each other.
日本液晶学会の論文
2001-09-24